Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba7a2f484e0762a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 05:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54c7513164d5976f46800902c4fb0567 SHA-1: 76352fb4300b23b65b98b5a39d9dc55d44daacb8 SHA-256: dba7a2f484e0762af7cec33fcd95b9ee700de091cdd3abe2ce5c7f32defbd282
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/fitibatumase.pdf In PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-15/20210915142414170097.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/94011679577.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613150e358e9f---nokizutidanerebow.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/44109660973.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/nalavirexogawexiwatavi.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vusebefere.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vebiludajijituzoxinuwor.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/wiwor.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/50298022637.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/54794644064.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tifugu.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/redap.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9l8o1lub0t3i9v1k5ibetulbi3/dukepupotevupag.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nopoganulojesamumosono.pdfIn PDF document text
    • http://hanauhrova.cz/files/7874219858.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/tuzitukoripogomofiwud.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16135a801af511---tuvajirozetimevapisamo.pdfPDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2dc6f0a1b47abd82c8909ba979585228/76537653056.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335f1b22dc4---58692286497.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/mipimabomiteton.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/28560903006.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/repivupitul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=malayalam+novels+pdf+free+downloadPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/33522047181.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC341 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 17052 bytes
SHA-256: 72958879f0331945b6a89fd744b7242788c48dadfa29fb4454557e528686d8a7
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 10728 bytes
SHA-256: 229b00d9622e3fdb7f0aaba3290bd14d783ecda6bfac6f7ccdb5dcfeab569097

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